Power-hammer.



No. 678,528. Patented July l6, I901.

F. W. TANNETT-WALKEB.

POWER HAMMER.

(Applicl-tion filed ha. 10, 1901.)

(No Modal.) 4 sums-sum l.

y 0/ J o 9- o z 1 O a/ i a mm; 1W

Patented July us, mm.

- F. W. TANNETT-WALKEB.

POWER HAMMER.

(Appl icltion filed Jan. 16, 1901.) (No Model.) 4 Sheets-Shout 2.

Nonms Prrzns 00., Pnovouv na. WASMIN No. 678,528. Paulina luly l6, l90l.

, r. w. TANNETT-WALKER.

POWER HAMMER.

- (pplicstion filed Jan. 16, 1901. (No Model.) 4 Sheets-Sheet 3.

g a Y t M Patented lu ly I6, l90l.

4 Sheets Sheet 4.

F. W. TANNETT-WALKER.

POWER HAMMER.

(Application filed In. 16, 1901.)

(No Model.)

fir

UNITED STATES PATENT OFFICE.

FREDERICK WILLIAM TANNETT- l/VALKER, OF LEEDS, ENGLAND.

POWER-HA-M MER.

S]?EClEFZlICATION forming part of Letters Patent 0. 678,523, dated July 16, 1901. Application filed January 16, 1901; Serial No. 43,527. (NO m el-J To all whom, it may concern.-

Be it known that I, FREDERICK WI LIAM TANNET'r-WALKER, engineer, a subject of the Queen of Great Britain, residing at Hunslet,

Leeds, in the county of York, England, haveinvented certain new and useful Improve-' ments in Power-Hammers, of which the following is a specification. I i

The object of this invention is to provide a hammer worked by hydraulic power. The

hammer works in a cylinder or guides and is bored to receive a piston carried at thelower end of a fixed rod, which passes through a suitable packing at the upper end of t-hehammer and is hollow, so that water passing down it enters the bored-out interior of the ham-' If the ham-.

mer, which can be thus raised. mer works in a cylinder, the air above it is thus compressed; but if it merely works in guides it may itself have a second cylinder bored in or attached to it, in which air may pressure is required it can be supplied froma small air-compressor or by employing an airvessel with suitable valves, which may be filled from the compressor or by a few upward strokes of the hammer, which will be sufficient to pump the required air into the air vessel, this air only having to be replaced to the extent that it leaks.

Figure 1 of the drawings is a side elevation of a hammer, partly in section; and Fig. 2, a front elevation. Fig. 3 is a front elevation of a modification, the air vessel and compressor being omitted; and Fig. 4, a vertical section, to an enlarged scale, of the hammer shown in Fig. 3 in its highest position.

Referring to Figs. 1 and 2, a is the main frame, formed with a cylinder b, in which moves the hammer a, carrying the strikinghead d and bored at its upper end to form the cylinder e, closed by the cover f, carrying suitable packing g, through which passes the hollow piston-rod h, carrying the fixed piston '5. Water under pressure can be admitted to the rod h' through any suitable valve j, operated by the handle it, and emerges [through the aperturesl, just above the piston i, into the cylinder e, so raising the ham -mer c, any leakage past the piston 'i escaping by the channel m. As the hammer c rises the airinthe'cylinder b is compressed above it. A pipe 12, provided with a non-return valve 0, communicating with the atmosphere, leads from the top of the cylinder 22 to an air vessel 19. The pipe n is also provided 4 with a cock q. An air-compressor '1" may be connected to the air vessel 19 by a pipe s. The fall of the hammer may thus be acceleratedby air compressed only by the rise of the hammer or by air compressed by the compressor r, or if this be not working the vessel p may be charged by raising the hammer a few times and closing the cock q during its descent.

When the operator desires to raise the hammer, he moves the valve j by the handle it, thus admitting water by the pipe h and apertures linto the cylinder 6, above the piston c. The hammer accordingly rises and compresses the air in the cylinder 6 above it. When the hammer is to fall, the operator moves the handle is back, thus cutting oif the supply of water and connecting the pipe h to the exhaust, on which the water in the upper part of the cylinder e escapes and the hammer falls, owing to its own weight and the pressure of the compressed air above it. The air-pressure due simply to the rise of the hammer may be augmented by an air-compressor r, or if the air-compressor is not in work by a few preliminary strokes of the hammer, the valve q being open while the hammer rises, so that the air in the vessel 13 is compressed but closed while the hammer falls, so that a fresh supply of air enters through the non-return valve 0. The hammer thus acts as its own compressor.

In the modification shown in Figs. 3 and 4 the hammer 0, instead of working in a closed cylinder 12, works in guides b. As the aircushion cannot now be formed above the hammer, a second cylinder t is formed in it, within which fits the fixed hollow piston to, com municating with the air-supply pipe 41 and furnished at its lower end with a spring-valve o. The bottom of the cylinder 15 is closed by a plug to, above which may be placed a buffer m, of india-rubber or similar material.

When water is admitted to cylinder e, the hammer is raised as before and air is compressed in the cylinder t by the plunger u, and when the water is allowed to escape the hammer falls owing to its own weight and the pressure of the air in the bottom of cylinder If. The pressure of air due simply to the rise of the hammer may be augmented by an air-compressor 'r, forcing air down the hollow piston or plunger u past the non-return valve 12.

What I claim is- 1. The combination of a tup, acylinder carried by the tup, a fixed piston-rod, a piston on the rod and working in the cylinder, means for admitting fluid into the cylinder above the piston, and an air-cushion resisting the rise of the tup.

2. The combination of atop, a cylinder carried by the tup, a fixed piston-rod, a piston on the rod and working in the cylinder, means for admitting fluid into the cylinder above the piston, an air-cushion resisting the rise of the tup, and an air-compressor feeding the air-cushion.

3. The combination of a tup, acylinder carried by the tup, a fixed piston-rod, a piston on the rod and working in the cylinder, means for admitting fluid into the cylinder above the piston, a second cylinder carried by the tup, a fixed piston fitting this cylinder, and means for admitting air to this cylinder.

4. The combination ofa tup, acylinder carried by the tup, a fixed hollow piston-rod, a piston on the rod and working in the cylinder, means for admitting fluid into the interior of the hollow piston-rod, and an air-cushion resisting the rise of the tup.

5. The combination of a tup,- acylinder carried by the tup, a fixed hollow piston-rod, a piston on the rod and working in the cylinder, means for admitting fluid into the interior of the hollow piston-rod, a second cylinder carried by the tup, a fixed piston fitting this cylinder, and means for admitting air to this cylinder.

6. The combination of a tup, acylinder carried by the tup, a fixed piston-rod, a piston on the rod and working in the cylinder, means for admitting fluid into the cylinder above 56 7. The combination of a tup, a cylinder carried by the tup, a fixed hollow piston-rod, a piston on the rod and Working in the cylinder, means for admitting fluid into the interior of the hollow piston-rod, a second cylinder carried by the tup, a fixed hollow piston fitting this cylinder, and means for admitting air to the interior of this piston.

8. In a hydraulic hammer, an air-cylinder carried by the tup, a fixed hollow piston flt-' ting this cylinder, a valve at the bottom of the hollow piston, and means for admitting air to the interior of the hollow piston.

9. In a hydraulic hammer, an air-cylinder carried by the tup, a fixed piston fitting this cylinder, means for admitting air to the cylinder, and an elastic buffer at the bottom of the cylinder.

10. In a hydraulic hammer, an air-cylinder carried by the tup, a fixed piston fitting the cylinder, and an air vessel in communication with the cylinder.

11. In a hydraulic hammer, an air-cylinder carried by the tup, a fixed piston fitting the cylinder, and an air-compressor in communication with the cylinder.

12. In a hydraulic hammer, an air-cylinder carried by the tup, a fixed piston fitting the cylinder, an air vessel in communication with the cylinder, and an air-compressor in communication with the cylinder.

13. The combination of a hammer, a cylinder carried by the hammer, a fixed pistonrod, a piston on the rod and working in the cylinder, means for admitting'fluid into the cylinder above the piston, an air-inlet at the top of the cylinder, and a non-return valve admitting air to the cylinder, but preventing its exhaust therefrom during the upward movement of the cylinder.

FREDERICK WILLIAM TANNE'lT-WALKER.

Witnesses:

JOHN HY WILLIAMSON, J OSH. HY WHITAKER. 

